Diestock



June. lll, 1935. WQOQTHEwEs y 2,004,639

\ DIESTOGK Filed April 11, 1955 :inventor /f/MM Patented June 117, 1935FFI,`

Vaou/insof-v j DIEYSTOCK Y William 0. Thewes, North Ridgeville, Ohio,as-

signer to The Ridge Tool Company:- North Ridgeville, Ohio, a corporationof` Ohio l Application April 11, 1933, Serial No. 665,533

v c claims;Y 4 01. 1105-124) This invention relates to a ratchet tool ordie stock. assembly of that type whereina toothed ratchet or drive ringadapted to receivethe tool to be driven is mounted in an actuatingAframe or barrel carrying a pawl for driving the ring. Tools of the typeto which this invention relates are used principally as light dutythread-cutters and include in the assembly a set of die holders or headswhich range in varying sizes to accommodate the particular diameter ofthe pipe or other article Vto be threaded and are eachprovided with adrive-ring engaging portion or drive barrel of standard externaldimensions kwhich detachably engages in the drive ring.

An object of the invention is to provide means of a simple and easilyoperated type for retain-- ing a die-holder or analogous part inaxially-removable association with the drive ring.

Another object of the vinventionris `to provide an improved type of pawlmechanism for coacting with the teeth of the drive ring whereby backlashor free. running in a driving directionv is reduced to a minimum withoutnecessitating a reduction in width of the teeth of said ring.

The foregoing and` other objects and advantages will 'become apparent inView of the following description taken in conjunction with the drawing,wherein:

Figure 1 is a view principally in axial section of a thread-cuttingtool'embodying the features of the invention;

Fig. 2 is a face View thereof; Fig. 3 is a view in section taken in aplane normal to the axis of the tool;-

Fig. 4 is a section takenv on the line ,ll-4,'

Fig. 2.

Referring in detail to the drawing, 5 designates the actuating frameor'barrel of the tool which. is provided with a handle socket' 6 adaptedtoV receive a handle l. Adjacent the handle is a pawl housing 8 in whicha pawl assembly is mounted, said assembly comprising a pair ofindependently movable pawl teeth S and 9a, each of which is providedwith a slot I6. These pawl teeth are mounted in a pawl housing or blockII and retained against displacement by a pin I2 which passes throughthe slots I0. Ihe pawl teeth are depressed against springs I3. 'Iheshank I I a of the pawl housing I I is provided with a cap or head I4having a direction-indicating arrow on the face thereof to indicate thedriving direction of the ratchet. The pawl housing II is provided with ashouldered portion which has mounted thereon a spring I 5 which servesto normally urge the entireassembly towardsv ratchet-engaging position.lY i Mounted for free rotation in the barrel 5 is a driving ringlfiprovide'dwith teeth I'I, said ring being held in assembledrelationwith respect to said barrel by means of a retainerv'ring I8. Theteeth- I1 of thedriving ring I6 are practically of the straight cuttypeand are relatively broad and therefore rugged and capable ofwithstanding relatively heavy driving strains. These teeth, however,lmay be made 'of any suitable dimensions in accordance with the Work thetool is required to perform. Byreferring to Fig. 3, it will be notedvthatthe multiple tooth construction of the pawl assembly reduces thefree-running or back-lash movement of the rbarrel 5 in direct proportionto the number of teeth in the as-l sembly. In the present instance,since two teeth are provided, the back-lash or-r'ree-running of thebarrel is reduced to fifty percent of what it `would normally be werethe pawl of the conventional one-tooth design. This is of considerableadvantage in tools of this type where it is desirable to utilize 'asingle pawl assembly acting at one point onlyfon the periphery ofthedriving ring. `Furthermore, in this construction the .teeth of the pawlmay be relatively rugged,

or of ample width to withstand any reasonablel work they may be calledupon to perform.

Tools of the present type are usually provided with sets of die holderswhich range in varying sizes in accordance with work of varyingdiameter. One of the die holders is generally indicated at"20 vand isprovided with a drive barrel 26a which is of polygonalror ilat sided'formation to con-form to--the contour ofthe driving ring I 6 andprovides a driving engagement therebetween. The driving ring I G isprovided rwith an annular groove 2I in` which a split Aring 22k isinserted, said ring being adapted forv resilient engagement'in grooves23 formed in the periph-y eral corners of the barrel 20d. These groovespreferably have tapered sides, and to save metal and lighten the toolfor dies of relatively smallr upon the ring 2| is spread or sprungoutwardly thereby clearing the grooves 23 and permitting the holder tobe easily removed axially outwardly. To substitute another block it isonly necessary to push the latter in place in an obvious manner. Amongthe advantages of this type of retaining means for the holders 2U arethat the latter can be applied from either side of the ratchetnin anaxial direction, it is not necessary vto turn the holder to anyparticular point in order to register with a key way when it is desiredto remove the holder, as in those types of tools wherein the holder hasa splined engagement with the ring; and the parts may be economicallyymanufactured.

It will be obvious that "the die.A holder and die could be made integraland that other types of tools could be substituted forthethread-,Qlltngdies and also for the die holder, and other lim-j ited structuralmodifications adopted Without de-l parting from the Scope Ofztheinvention as defined by the appendedy olaims Y I claim: L 1. A die stockassemblyfcomprising an actuating frame, a ratchet drive ringmounted forrelative rotation in said frame, pawl mechanism associated withsaidframe and ring ifor rotating complementary groove, anda splitspringy ring p0.-`

sitioned in said grooves and serving to releasably hold lthe barrelagainst axialdisplacement with respect to said ring. j Y f 2. A diestock assembly comprising an actuating frame, a ratchet drive ringmounted for relative rotation in said frame, pawl mechanism associatedwith said frame and adapted yto inter-,- mittently engage said ring,adie holder provided with a drive barrel adapted to be inserted in saidring, saidring and barrel being provided with coacting continguoussurfaces of polygonal' formas tion to provide a driving engagement,therebetween, the peripheral surface of said barrel land the contiguoussurface of said` rngbeing formed with complementary grooves, and a.split retaining ring positioned in said grooves and serving toreleasably retain the holderagainst axial displacementwith respect tosaid ring, the end of said. barrelbeingprojected outwardly with respectto said ring tol provide a thumb-engaging portion to facilitate removaloi said holder. i

3; In a die stock, an actuating `vhandle fra-me, a' ratchet ring mountedfor Yrelative rotation in said frame andY having substantiallystraight-cut teeth, and pawl mechanism for initiating a drivingconnection between the frame and said ring, said pawl mechanismincluding a spring-pressed housing block which is mounted for limitedradial sliding movement in said frame adjacent said ring and a pluralityof independently-movable springpressed pawls mounted for limited radialmovement in said block and having tooth-engaging portions which face inthev same direction, said pawls being of such width and spacing as toa1- ternately mesh with each successive tooth of said une.

'4. In a die stock, an actuating handle frame, provided with a pawlhousing, and pawl mechanism mounted in said housing, said pawl mechanismcomprising a spring-pressed pawl housing block, a pair of independentlymovable pawl teeth mounted in said block and having tooth-engagingportions ,which face in the same direction, said teeth being providedwith aligned openings, a retainingpin secured in the sides of the pawlblock andA` extending through said openings to retain said pawls Vinsaid block, and a ratchet drive ring mounted in said frame and providedwith substantiallystraight out teeth adapted for engagement with saidpawl teeth, the width and spacing of the pawl teeth with respect to thedrive ring teeth being such as to cause alternate successive meshing ofthe pawl teeth with the drive ring teehil l K .5;.A die stock assemblycomprising: an actuatingrame, a drive ring mounted for relative rotationin said frame and having a polygonalshaped:'opening therein, meansassociated with said frame and ring for rotating the latter, a toolhelder having a drive barrel with a polygonal shaped periphery insertedin said openingvto provide-a driving engagement with said ring, theperiphery ofthe barrell beingforrned with anannular groove'havingtapered cam-like side walls, and va split: spring ring positioned in agroove formed inthe inner periphery of the drive ring; and resilientlyengaging Ain the groove of said barrel whereby'the latter is releasablyheld in the drivering.. n s

61Al die'stock assembly comprising: an actuating i:`ra`me,-a drive ringmounted. for relative rotation in said frame and having apolygonalshaped opening therein, means associated with said frame andring for rotating the latter, a tool holder provided with a drive barrelhaving a polygonal contour complemental to said drive ring opening, theinner periphery ofr the drive ring being formed with an annular grooveand the said barrel being formed with a complemental peripheral groove,and asplit spring ring positioned in the groove of the drive ring andreleasably engaging in the groove of .the drive barrel, said lattergroove having tapered cam-like side wallsI to permit thumb pressure??removal' ofsaid barrel.

WILLIAM O. THEWES.

